Aims: This study aims to produce Achromobacter biosurfactant in nutrient-rich and nutrient-limited media. Methodology and results: This study conducted fermentation on nutrient-rich and nutrient-limited media using a minimal salt medium (MSM). Dextrose and sodium citrate were used as sole carbon supplemented with 0.5% yeast extract for nutrient-rich media, while nutrient-limited media used molasses and rice straw hydrolysate (RSH) at variations of concentrations of 100 ppm and 200 ppm. The research was performed over 120 h and evaluated from growth response, surface tension and emulsification activity. The study revealed that the best surface tension value was when 2% (w/v) sodium citrate was used as C-source and 0.5% (w/v) yeast extract as N-source, after 72 h upon incubation at 30 °C/120 rpm having 45.45 ± 2.19 mN/m with emulsification activity 24.54 ± 3.42%. Whereas the best result of the nutrient-limited medium was obtained by RSH at a concentration of 200 ppm having 48.86 ± 5.36 mN/m. Conclusion, significance and impact of study The experiment showed that nutrient-limited medium from rice straw hydrolysate could compete with the nutrient-rich medium. The use of rice straw will contribute to the reduction of biosurfactant production costs and valorisation of agricultural waste.
Achromobacter denitrificans ; Surface-Active Agents

No abstract available.
Achromobacter denitrificans* ; Achromobacter* ; Endophthalmitis*

Achromobacter xylosoxidans is a non-fermentative, aerobic, oxidase, and catalase-positive Gram-negative rod similar to Pseudomonas species. This organism colonizes aquatic environments and can cause nosocomial infections, especially in patients with immune deficiency such as human immunodeficiency virus infection, cancer, cystic fibrosis, neutropenia, and immunoglobulin M deficiency. Infections are found as bacteremia, pneumonia, meningitis, urinary tract infection, abscess formation, and osteomyelitis. It is known that most effective antibiotics are piperacillin/tazobactam, meropenem, and trimethoprim/sulfamethoxazol. But there is no optimal antibiotic therapy so far. We present a case of Achromobacter xylosoxidans bacteremia in a 13-month-old Korean girl who had past history of neutropenia.
Abscess ; Achromobacter denitrificans* ; Achromobacter* ; Anti-Bacterial Agents ; Bacteremia* ; Child* ; Colon ; Cross Infection ; Cystic Fibrosis ; Female ; HIV ; Humans ; Immunoglobulin M ; Infant ; Meningitis ; Neutropenia* ; Osteomyelitis ; Oxidoreductases ; Pneumonia ; Pseudomonas ; Urinary Tract Infections

No abstract available.
Achromobacter denitrificans/isolation & purification ; Alcaligenes/isolation & purification ; Bordetella Infections/*microbiology ; Bordetella bronchiseptica/isolation & purification ; Crush Injuries/*microbiology ; Fractures, Bone/*microbiology ; Humans ; Male ; Middle Aged ; Surgical Wound Infection/*microbiology ; Tibial Fractures/microbiology

Achromobacter xylosoxidans can cause various types of infections, but its infection in humans is rare. A. xylosoxidans has been reported as a rare etiological agent of infections including primary bacteremia, catheter-related bloodstream infection, endocarditis, otitis, and pneumonia, particularly in immunocompromised hosts. We encountered a case of septic shock caused by A. xylosoxidans in a 52-year-old, immunocompetent woman with no underlying disease, who received extracorporeal shock wave lithotripsy to remove a left upper ureteral stone. She was treated with antibiotics to which the organism was susceptible but died as a result of septic shock.
Achromobacter denitrificans* ; Achromobacter* ; Anti-Bacterial Agents ; Bacteremia ; Endocarditis ; Female* ; Humans ; Immunocompromised Host ; Lithotripsy* ; Middle Aged ; Otitis ; Pneumonia ; Shock* ; Shock, Septic* ; Ureter*

Achromobacter xylosoxidans is an opportunistic organism, mainly causing infection in immune compromised hosts, such as patients on dialysis. However, review of the medical literature showed that few cases of A. xylosoxidans infections following total knee arthroplasty have been reported. This organism has not been reported in prosthetic joint infections of patients who are not immune compromised. Here, a case of periprosthetic infection with A. xylosoxidans following total knee arthroplasty in a man with no medical history of immune suppression is reported.
Achromobacter denitrificans* ; Arthroplasty* ; Dialysis ; Humans ; Joints ; Knee*

Achromobacter denitrificans ; Adult ; Gram-Negative Bacterial Infections ; complications ; Humans ; Jaundice, Obstructive ; etiology ; Liver Abscess ; microbiology ; Male

To report on Achromobacter xylosoxidans keratitis in two healthy patients who had worn contact lenses foran extended period of time. A 36-year-old female and a 21-year-old female visited our hospital with ocular pain and blurred vision. Both patients had a history of wearing soft contact lenses for over fve years with occasional overnight wear. At the initial presentation, a slit lamp examination revealed corneal stromal infiltrations and epithelial defects with peripheral neovascularization in both patients. Microbiological examinations were performed from samples of corneal scrapings, contact lenses, contact lens cases, and solution. The culture resulting from the samples taken from the contact lenses, contact lens cases, and solution were all positive for Achromobacter xylosoxidans. Confrming that the direct cause of the keratitis was the contact lenses, the frst patient was prescribed ceftazidime and amikacin drops sensitive to Achromobacter xylosoxidans. The second patient was treated with 0.3% gatifoxacin and fortifed tobramycin drops. After treatment, the corneal epithelial defects were completely healed, and subepithelial corneal opacity was observed. Two cases of Achromobacter xylosoxidans keratitis were reported in healthy young females who wore soft contact lenses. Achromobacter xylosoxidans should be considered a rare but potentially harmful pathogen for lens-induced keratitis in healthy hosts.
Achromobacter denitrificans/*isolation & purification ; Adult ; Amikacin/administration & dosage ; Anti-Bacterial Agents/*administration & dosage ; Ceftazidime/administration & dosage ; Contact Lenses, Extended-Wear/*adverse effects ; Female ; Fluoroquinolones/administration & dosage ; Gram-Negative Bacterial Infections/diagnosis/*drug therapy/*microbiology ; Humans ; Keratitis/diagnosis/*drug therapy/*microbiology ; Tobramycin/administration & dosage

Bacterial peritonitis is a well-recognized complication of continuous ambulatory peritoneal dialysis (CAPD) in patients with end-stage renal failure. Achromobacter xylosoxidans subsp. xylosoxidans is a catalase and oxidase positive, motile, nonfermentative and gram-negative rod bacterium that is a rare pathogen in humans and has rarely been reported as an opportunistic human pathogen. We present a case of peritonitis due to unusual pathogens, Achromobacter xylosoxidans subsp. xylosoxidans. A 49-year-old diabetic man undergoing CAPD for 90 days developed the first peritonitis due to Achromobacter xylosoxidans subsp. xylosoxidans. A. xylosoxidans was detected from a culture of peritoneal fluid. Susceptible antibiotic treatment was provided.
Achromobacter ; Achromobacter denitrificans ; Ascitic Fluid ; Catalase ; Humans ; Kidney Failure, Chronic ; Middle Aged ; Oxidoreductases ; Peritoneal Dialysis ; Peritoneal Dialysis, Continuous Ambulatory ; Peritonitis

Peritonitis is a major cause of morbidity in continuous ambulatory peritoneal dialysis (CAPD) patients. Achromobacter xylosoxidans is a rarely reported cause of peritonitis in CAPD patients. In this report, a peritonitis case due to Achromobacter xylosoxidans in a 60-year-old male patient with end-stage renal failure receiving CAPD for 7 years, has been reported. White blood cell (WBC) count in peritoneal fluid was 3,160/mm3 with 95% neutrophil. Gram staining of the peritoneal fluid yielded gram negative rod. Empirical antibiotic therapy with ceftriaxone was initiated intraperitoneally. But drug sensitivity test revealed these regimens were resistant. On fourth hospital day, Achromobacter xylosoxidans was cultured from peritoneal effluent, the antibiotic regimen was switched to piperacillin/tazobactam intraperitoneally. The patient rapidly recovered and the WBC count of the peritoneal effluent decreased. The therapy was continued for 14 days and then the patient was discharged. The peritoneal catheter was not removed.
Achromobacter ; Achromobacter denitrificans ; Ascitic Fluid ; Catheters ; Ceftriaxone ; Humans ; Kidney Failure, Chronic ; Leukocytes ; Male ; Middle Aged ; Neutrophils ; Peritoneal Dialysis, Continuous Ambulatory ; Peritonitis